You’re allowed to be attached to any theory you want, as long as you don’t let it override your judgement of the actual evidence. In this sense it’s probably be

You’re allowed to be attached to any theory you want, as long as you don’t let it override your judgement of the actual evidence. In this sense it’s probably better that you’re cognizant and open about your personal bias, rather than pretending it doesn’t exist (or overcompensating in the other direction and thus developing a new bias.)